Dokumente Fakultät für Physik (inkl. GAUSS) nach Gutachter "Jooß, Christian Prof. Dr."
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Correlation between Thermal Transport Mechanisms and Microstructure of Epitaxially Grown (Sb1-xBix)2Te3 Thin Films
(2019-05-23)This thesis experimentally studies the mechanisms associated with the very low lattice thermal conductivities of the ternary van der Waals layered compound (Sb1-xBix)2Te3. This compound presently constitutes one of the ... -
Defektabhängige Transporteigenschaften von Praseodym-Kalzium-Manganat
(2009-11-24)Highly correlated electron-systems are characterised by a tight connection between the structure and the transport properties. This work investigates praseodymium calcium magnates (PCMO), ... -
Electrical characterization of conductive ion tracks in tetrahedral amorphous carbon with copper impurities
(2014-01-10)The irradiation of tetrahedral amorphous carbon (ta-C) with swift heavy ions leads to the formation of conductive microscopic ion tracks with diameters of about 10 nm. This phenomena depends on the sp² to sp³ hybridization-ratio ... -
Electronic and Structural Properties of Heterojunctions in Solar Cells studied by In-situ and Analytical Transmission Electron Microscopy
(2023-11-03)The overarching goal of this dissertation is to investigate new principals to increase photovoltaic efficiency. In this context, three topics are presented, one concerning the application of carrier selective contacts ... -
Elektrischer Transport und remanentes Widerstandsschalten in \(Pt-Pr_{0.7}Ca_{0.3}MnO_3-Pt\) Sandwichstrukturen
(2015-12-07)This work investigates voltage pulse induced changes in the electrical resistance of praseodymium- calcium- manganite (PCMO). Either chemical or pure structural changes in the PCMO are suggested as possible mechanisms for ... -
Elektronenmikroskopische Untersuchung des Einflusses elektrischer Felder auf das Sinterverhalten von Oxidkeramiken
(2023-11-09)Despite the wide application potential of flash sintering for processing ceramic materials, the physical origins of the effect remain unclear. Therefore, the primary objective of this work is to gain a deeper understanding ... -
First-principles calculations of polaronic correlations and reactivity of oxides: manganites, water oxidation and Pd/rutile interface
(2019-05-28)The electronic, magnetic and atomic structure of Pr1−xCaxMnO3 have been investigated using combination of first-principles calculations, x-ray photoelectron spectroscopy (XPS), x-ray absorption spectroscopy (XAS), and ... -
Gestaltung der elektronischen Korrelationen in Perowskit-Heterostrukturen auf atomarer Skala
(2016-01-19)For the deposition of high quality heterostructures consisting of transition metal perovskites a new system for metalorganic aerosol deposition with growth control by in-situ ellipsometry was developed. By numerical ... -
Hochauflösende mikroskopische und spektroskopische Untersuchungen zur strukturellen Ordnung an MgO-CoFeB-Grenzflächen
(2014-11-04)Magnetic tunnel junctions (MTJ), with crystalline MgO tunnel barrier sandwiched between amorphous CoFeB electrodes, received much attention due to their high tunnel magneto resistance (TMR) and flexible integration into ... -
Hybrid systems of molecular ruthenium catalyst anchored on oxide films for water oxidation: Functionality of the interface
(2017-11-03)The scope of the presented thesis is the realization and detailed analysis of a hybrid system for photoelectrochemical watersplitting with La$_{0.6}$Sr$_{0.4}$MnO$_3$ (LSMO) as photoabsorber and immobilized molecular ... -
Implementation and quantification of scanning transmission EBIC experiments for measuring nanometer diffusion lengths in manganite-titanite p-n heterojunctions
(2019-01-08)The scanning transmission electron beam induced current (STEBIC) approach to measure charge carrier diffusion lengths in the nanometer range in 3rd generation photovoltaics devices is presented, evaluated and applied to ... -
In Situ X-ray Spectroscopy and Environmental TEM Study on Manganite Water Oxidation Catalysts
(2017-11-29)This thesis presents in situ studies on the active states of manganite water oxidation catalysts in water vapor. The study in chapter 2 probes the surface electronics of the strongly correlated Pr1-xCaxMnO3 (0In-Situ Environmental TEM Studies of Electro- and Photo-Electrochemical Systems for Water Splitting
(2021-02-22)This thesis presents studies on the structure and stability of materials for electrochemical water splitting and the changes in the active state. The stability of a TiO2 protection layer on a silicon multi-junction is ...In-situ Environmental Transmission Electron Microscopy Investigation of Perovskite Oxide Thin Films During Electrochemical Oxygen Evolution Reaction.
(2022-07-21)Despite many theoretical and experimental efforts to find active catalysts in oxygen evolution reaction (OER), the mechanism for high activity and long-term OER stability remains elusive. Catalyst-electrolyte interface ...Investigation of the Influence of Correlations on Photovoltaic Energy Conversion in Hot Polaron Solar Cells
(2022-08-08)In semiconductor single junction solar cells fundamental limitations are given by the two major intrinsic loss mechanisms: a) inability to absorb photons with energies below the band and b) thermalization of photon energies ...Kationen-Ordnung in ferri/ferromagnetischen perowskitischen Dünnfilmen
(2015-07-27)A major obstacle to the applicability of oxide perovskites in electrical or spintronic applications is the size of the specific temperatures at which the physical phenomena such as ferromagnetism or high-temperature ...Kationordnung und Grenzflächeneffekte in stark korrelierten Elektronensystemen
(2021-10-05)The work is about cation ordering and interface mechanism in strongly correlated electron systemsKünstliche und selbstorganisierte Nanokomposite basierend auf oxidischen Verbindungen
(2011-10-25)Due to the large amount of phase and grain boundaries as well as the small length scales, highly efficient transport phenomena and coupling effects may occur in nano composite materials ...Magneto-thermal conductivity of perovskite manganite films and exchange-spring coupled superlattices
(2024-02-21)In this thesis, thin colossal magnetoresistive perovskite manganite films and superlattices forming an exchange spring magnet were studied regarding their magneto-thermal conductivity. Using the metalorganic aerosol ...Magnetoelektrische Eigenschaften von Manganat-Titanat Übergittern
(2010-01-28)Magnetoelectric multiferroics are materials in which the order phenomena ferromagnetism and ferroelectricity coexist. Due to pronounced magnetic as well as electric susceptibility, this ...